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A nanofiltration membrane for an integrated intelligent water purification faucet and its preparation method

A nanofiltration membrane and integrated technology, applied in the field of drinking water equipment, can solve the problems of low flux of nanofiltration membrane, filter element does not have nanofiltration function, limited faucet structure, etc.

Active Publication Date: 2019-08-23
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, limited by the structure of the faucet, the faucet cannot effectively achieve deep purification of tap water
[0013] It can be seen that the existing smart faucet is limited by the size of the faucet pipeline and the performance of the filter element, especially the filter element does not have the function of nanofiltration, and cannot effectively realize the deep purification of tap water
In addition, the existing nanofiltration membranes generally have low flux and lack of intelligent response functions, which greatly limit their application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Embodiment 1: the preparation of nanofiltration membrane of the present invention

[0125] The implementation steps of this embodiment are as follows:

[0126] A. Choose non-woven support

[0127] According to the weight per unit area 38g / m 2 , air permeability coefficient 0.1mL / cm 2 / s and the diameter of the polymer fiber is 22 μm, and polyethylene terephthalate is selected as the non-woven support;

[0128] B. Preparation of polymer support intermediate layer

[0129] A non-solvent-induced phase inversion method is used to compound a layer of polymer support middle layer with holes on the non-woven support; the diameter of the holes is 0.1 μm, the thickness is 18 μm, and the holes run through the entire middle of the polymer support layer, and has an axisymmetric structure or a non-axisymmetric structure;

[0130] C. Preparation of dense separation layer

[0131] The dense separation layer is prepared by conventional dilute solution coating method;

[0132] Th...

Embodiment 2

[0134] Embodiment 2: the preparation of nanofiltration membrane of the present invention

[0135] The implementation steps of this embodiment are as follows:

[0136] A. Choose non-woven support

[0137] According to the unit area weight 88g / m 2 , air permeability coefficient 10mL / cm 2 / s and the diameter of the polymer fiber is 34 μm, and poly(hexanediol adipate) is selected as the non-woven support;

[0138] B. Preparation of polymer support intermediate layer

[0139] A non-solvent-induced phase inversion method is used to compound a layer of polymer support middle layer with holes on the non-woven support; the diameter of the holes is 0.005 μm, the thickness is 24 μm, and the holes run through the entire middle of the polymer support layer, and has an axisymmetric structure or a non-axisymmetric structure;

[0140] C. Preparation of dense separation layer

[0141] The dense separation layer is prepared by conventional dilute solution coating method;

[0142] The dil...

Embodiment 3

[0144] Embodiment 3: the preparation of nanofiltration membrane of the present invention

[0145] The implementation steps of this embodiment are as follows:

[0146] A. Choose non-woven support

[0147] According to the weight per unit area 20g / m 2 , air permeability coefficient 3.8mL / cm 2 / s and polymer fiber diameter 0.05μm, choose polyacrylonitrile as the non-woven support;

[0148] B. Preparation of polymer support intermediate layer

[0149] A non-solvent-induced phase inversion method is used to compound a layer of polymer support middle layer with holes on the non-woven support; the diameter of the holes is 0.02 μm and the thickness is 10 μm, and the holes run through the entire middle of the polymer support layer, and has an axisymmetric structure or a non-axisymmetric structure;

[0150] C. Preparation of dense separation layer

[0151] The dense separation layer is prepared by conventional dilute solution coating method or interfacial polymerization method;

...

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Abstract

The invention relates to a nanofiltration membrane for a one-piece intelligent water purification faucet and a preparation method thereof. The nanofiltration membrane is composed of the following layers in sequence: a nonwoven supportive base layer with a thickness of 10-70 [mu]m, a polymer supportive middle layer with a thickness of 10-30 [mu]m, and a compact separation layer surface layer with a thickness of 30-100 nm. The provided nanofiltration membrane has an ultrahigh throughput and high hardness elimination rate under an ultralow pressure condition; can realize structure performance response to change the water yield and water quality according to the change of environment, and satisfies the requirements of users on water yield and water quality. The produced nanofiltration membrane can better meet the requirements of households on the water purification membranes, and has a good application prospect.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of drinking water equipment. More specifically, the present invention relates to a nanofiltration membrane used for an integrated intelligent water purification faucet, and also relates to a preparation method of the nanofiltration membrane. [0003] 【Background technique】 [0004] High-flux nanofiltration membranes have always been a research hotspot, especially how to increase the flux of nanofiltration membranes without losing the rejection rate has become an important hotspot. At present, the main means to solve this problem is to change the formulation system. However, it usually has some negative effects, such as not being able to effectively expand the range of molecular or ion rejection, but also causing a decrease in anti-pollution or chlorine resistance, and an increase in cost. [0005] The flux of the nanofiltration membrane used in the nanofiltration water purifiers currently on the mar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/10C02F1/44
Inventor 陈亦力张庆磊彭文娟李锁定张翠苗汪洋
Owner BEIJING ORIGIN WATER FILM TECH
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